scikit learn - Missing data in Dataframe using Python -


[dataframe]

hi ,

attached data, can please me handle missing data in "outlet_size" column. can use complete data preparing datascience models.

thanks,

these 1 of major challenges of data mining problems (or machine learning). decide missing data based on pure experience. mustn't @ data science blackbox follows series of steps successful @ it!

some guidelines missing data.

a. if more 40% of data missing column, drop it! (again, 40% depends on type of problem you're working with! if data super crucial or trivial can ignore it).

b. check if there someway can impute missing data internet. you're looking @ item weight! if there anyway know product you're dealing instead of hashed coded item_identifier, can literally google , figure out.

c. missing data can classified 2 types:

mcar: missing @ random. desirable scenario in case of missing data.

mnar: missing not @ random. missing not @ random data more serious issue , in case might wise check data gathering process further , try understand why information missing. instance, if of people in survey did not answer question, why did that? question unclear? assuming data mcar, missing data can problem too. safe maximum threshold 5% of total large datasets. if missing data feature or sample more 5% should leave feature or sample out. therefore check features (columns) , samples (rows) more 5% of data missing using simple function

d. posted in comments, can drop rows using df.dropna() or fill them infinity, or fill them mean using df["value"] = df.groupby("name").transform(lambda x: x.fillna(x.mean())) groups column value dataframe df category name, finds mean in each category , fills missing value in value corresponding mean of category!

e. apart either dropping missing values, replacing mean or median, there other advanced regression techniques can use has way predict missing values , fill it, e.g (mice: multivariate imputation chained equations), should browse , read more advanced imputation technique helpful.


Comments

Post a Comment

Popular posts from this blog

angular - Ionic slides - dynamically add slides before and after -

hi i'm using ngfor create set of 3 slides while starting in middle i'm guaranteed able slide left or right on start. when slide right can simple listen reachedend , push slide array i'm looping. but have problem adding slide beginning. if same above , use e.g. array.unshift() or spread add item beginning, view think it's on position 0 , snaps view new slide. the code below work animates slide change index 1. slide = [0,1,2] //example loop slidechanged(event) { if(this.slides.isbeginning()){ this.slide = [this.slide[0]-1, ...this.slide]; this.slides.update(); this.slides.slideto(1) } } <ion-slides [initialslide]="1" (ionslidedidchange)="slidechanged($event)"> <ion-slide *ngfor="let item of slide"> <h1>slide {{item}}</h1> </ion-slide> </ion-slides> any appreciated! you can using ionslidenextend , ionslideprevend events slides . please
Read more

minify - Minimizing css files -

i want know how css files can minimized. currently, using external sites css minifier compress css files. however, after removing whitespaces, comments, etc, file sizes reduced 10-15%. how frameworks bootstrap manage make minimized versions kilobytes. as example, css is: body { background-color: #ff0; } the reduction goes 28 bytes 22 bytes other css files have lot more characters still smaller this. actually minifying code means it's remove thing code white space characters new line characters comments block delimiters it reduces amount of code has transferred on web , speed site load fastly.but unreadable format.
Read more

Add a dynamic header in angular 2 http provider -

i have http interceptor built via tutorial https://scotch.io/@kashyapmukkamala/using-http-interceptor-with-angular2 the problem need have dynamic header changes automatically once changes 'mode' in app. service able tell interceptor change header, or have interceptor pull header (which string)from service each request. able throwing away patch method, call http.patch('new header string') set header string. call in service controls 'mode' setting. wondering if there way interceptor pull recent value service each request or if can add method http provider via interceptor? i've tried call service in interceptor each request returns undefined. because creating new instance of service or copying value before service fired , loaded/changed data. i don't want pass header string every http provider call because defeats purpose of having interceptor, id able set once changes or have provider fetch service before makes request. tl;dr : need add autom
Read more